APPENDIX B
APPENDIX B
APPENDIX B
APPENDIX B
APPENDIX B
Industrial Termination Board
41
Applications
• Field wiring for analog and digital I/O channels of PC-LabCards
which employ standard or DB-37 connectors
• Signal-conditioning circuits can be implemented as illustrated in the
following examples:
Internal
connector
R
a
C
0
R
b
AIO
A GND
Terminal
block
a) Straight-through connection (factory setting):
R
a
= 0 W jumper
R
b
= none (open)
C
0
= none(open)
b) 1.6 KHz (3 dB) low pass filter:
R
a
= 10 KW
R
b
= none
C
o
= 0.01 mF
c) 10:1 voltage attenuator:
R
a
= 9 KW
R
b
= 1 KW
C
0
= none
(Assume source impedance
«
10 KW )
d) 4-20 mA to 1-5 V
DC
signal converter:
Ra = 0 W jumper
R
b
= 250 W (0.1% precision resistor)
C
0
= none
1
2pRaC0
Attenuation =
Rb
Ra + Rb
f
3 dB =
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